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There was a Hot Rod article * on aerodynamics that had tips on aerodynamics for the same year car as you have. It was suggested that at the track, you could improve your aero by simply stuffing a towel in the gap between the rear spoiler and the trunk.
Though crude, this forces air up and over the spoiler, which has a clean separation line, versus the overly rounded curve of the trunk, which creates a more turbulent wake.
Personally, I would just install a spoiler from a Formula of the same year since it is already sealed.
Like aerohead mentioned, the rear fenders start to curve sharply pretty early.
If you can add a raised trip strip, or trip ramp to snag the air and give it a clean break, you might could improve the aero a bit.
* Having a hard time finding the article since I'm posting this using my phone .
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